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#
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# Copyright (c) 2005 Ondrej Palkovsky
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# Copyright (c) 2005 Ondrej Palkovsky
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# Copyright (c) 2006 Martin Decky
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# Copyright (c) 2006 Martin Decky
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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	movl %ebx, grub_ebx
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	movl %ebx, grub_ebx
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	# Protected 32-bit. We want to reuse the code-seg descriptor,
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	# Protected 32-bit. We want to reuse the code-seg descriptor,
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	# the Default operand size must not be 1 when entering long mode
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	# the Default operand size must not be 1 when entering long mode
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	movl $0x80000000, %eax
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	movl $(INTEL_CPUID_EXTENDED), %eax
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 	cpuid
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 	cpuid
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 	cmp $0x80000000, %eax						# any function > 80000000h?
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 	cmp $(INTEL_CPUID_EXTENDED), %eax
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	jbe long_mode_unsupported
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	ja extended_cpuid_supported
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- 
 
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		movl $extended_cpuid_msg, %esi
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		jmp error_halt
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- 
 
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	extended_cpuid_supported:
- 
 
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	movl $(AMD_CPUID_EXTENDED), %eax			# Extended function code 80000001
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	movl $(AMD_CPUID_EXTENDED), %eax
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	cpuid
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	cpuid
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	bt $29, %edx								# Test if long mode is supported.
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	bt $(AMD_EXT_LONG_MODE), %edx
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 	jc long_mode_supported
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 	jc long_mode_supported
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	long_mode_unsupported:
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		movl $long_mode_msg, %esi
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		movl $long_mode_msg, %esi
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		jmp error_halt
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		jmp error_halt
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	long_mode_supported:
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	long_mode_supported:
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- 
 
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	bt $(AMD_EXT_NOEXECUTE), %edx
- 
 
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	jc noexecute_supported
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		movl $noexecute_msg, %esi
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		jmp error_halt
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- 
 
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	noexecute_supported:
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- 
 
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	movl $(INTEL_CPUID_STANDARD), %eax
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	cpuid
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	bt $(INTEL_FXSAVE), %edx
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 	jc fx_supported
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- 
 
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		movl $fx_msg, %esi
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		jmp error_halt
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- 
 
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	fx_supported:
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- 
 
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	bt $(INTEL_SSE2), %edx
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 	jc sse2_supported
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- 
 
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		movl $sse2_msg, %esi
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		jmp error_halt
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- 
 
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	sse2_supported:
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#ifdef CONFIG_FB
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#ifdef CONFIG_FB
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	mov $vesa_init, %esi
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	mov $vesa_init, %esi
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	mov $VESA_INIT_SEGMENT << 4, %edi
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	mov $VESA_INIT_SEGMENT << 4, %edi
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	mov $e_vesa_init - vesa_init, %ecx
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	mov $e_vesa_init - vesa_init, %ecx
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	cld
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	cld
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	mov %bx, KA2PA(vesa_scanline)
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	mov %bx, KA2PA(vesa_scanline)
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	shr $16, %ebx
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	shr $16, %ebx
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	mov %bx, KA2PA(vesa_bpp)
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	mov %bx, KA2PA(vesa_bpp)
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#endif
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#endif
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	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
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	# Enable 64-bit page translation entries - CR4.PAE = 1.
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	# Paging is not enabled until after long mode is enabled
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	# Paging is not enabled until after long mode is enabled
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	movl %cr4, %eax
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	movl %cr4, %eax
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	btsl $5, %eax
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	btsl $5, %eax
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	movl %eax, %cr4
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	movl %eax, %cr4
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	# Enable long mode
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	# Enable long mode
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	movl $EFER_MSR_NUM, %ecx	# EFER MSR number
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	movl $EFER_MSR_NUM, %ecx	# EFER MSR number
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	rdmsr						# Read EFER
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	rdmsr						# Read EFER
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	btsl $AMD_LME_FLAG, %eax	# Set LME=1
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	btsl $AMD_LME_FLAG, %eax	# Set LME = 1
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	wrmsr						# Write EFER
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	wrmsr						# Write EFER
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	# Enable paging to activate long mode (set CR0.PG=1)
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	# Enable paging to activate long mode (set CR0.PG = 1)
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	movl %cr0, %eax
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	movl %cr0, %eax
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	btsl $31, %eax
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	btsl $31, %eax
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	movl %eax, %cr0
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	movl %eax, %cr0
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	.long 0
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	.long 0
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grub_ebx:
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grub_ebx:
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	.long 0
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	.long 0
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- 
 
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extended_cpuid_msg:
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	.asciz "Extended CPUID not supported. System halted."
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long_mode_msg:
 671 
long_mode_msg:
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	.asciz "64 bit long mode not supported. System halted."
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	.asciz "64 bit long mode not supported. System halted."
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noexecute_msg:
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	.asciz "No-execute pages not supported. System halted."
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fx_msg:
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	.asciz "FXSAVE/FXRESTORE instructions not supported. System halted."
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sse2_msg:
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	.asciz "SSE2 instructions not supported. System halted."